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Assume that children take their first steps at an average age of 12 months with a standard deviation of 1.5 and that these ages

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Assume that children take their first steps at an average age of 12 months with a standard deviation of 1.5 and that these ages are normally distributed. What proportion of children take their first steps when they were between 9 and 13 months old? Your answer should have 4 decimal places.

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